Electrochemistry has broad applications in energy chemistry, environmental chemistry and analytical chemistry. Compared with other chemical processes, electrochemical processes have some unique characteristics: Electrochemical processes occur at the interface between electrode and electrolyte, and due to the strong electric field near the surface of electrode, on the kinetics and mass transport of chemical reactions at electrode-electrolyte interface are significantly different from those of other homogeneous and heterogeneous reactions. Therefore, it is necessary to understand the underlying principles of electrochemical reactions through the learning of this course. Students for this course should finished the study of 'Physical Chemistry I' at the undergraduate stage. In this course, we will combine building physical models and mathematical derivation, and analyze the electrode processes from the aspects of structure of electrode-solution interface, mass transport in solution, and kinetics of reactions on the surface of electrode. This course will also introduce some experimental techniques including potential step method, potential sweep method, and impedance method. The knowledge of this course is the fundamental of the researches in the fields of electrochemical catalysis, chemical battery, capacitors, and electrochemical analysis.